<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>

<!-- 父组件模板 -->
<div id="app">
    <cpn @item-click="cpnClick"></cpn>
</div>

<!-- 子组件模板 -->
<template id="cpn">
    <div>
        <button v-for="item in categories" @click="btnClick(item)">{{item.name}}</button>
    </div>
</template>

<script src="../js/vue.js"></script>
<script>
    //1.子组件
    const cpn = {
        template: '#cpn',
        data() {
            return {
                categories: [
                    {id: 'aaa', name: '热门推荐'},
                    {id: 'bbb', name: '手机数码'},
                    {id: 'ccc', name: '家用家电'},
                    {id: 'ddd', name: '电脑办公'}
                ]
            }
        },
        methods: {
            btnClick(item) {
                //发射事件：自定义事件
                this.$emit('item-click', item)
            }
        }
    }

    const app = new Vue({
        el: '#app',
        data: {
            info: {
                name: 'why',
                age: 18,
                height: 1.88
            },
            message: 'aaaaaa'
        },
        components: {
            cpn
        },
        methods: {
            cpnClick(item) {
                console.log('cpnClick', item)
            }
        }
    })
</script>

</body>
</html>